cli (event): update commands following changes in events: - commands have been update to match changes in bridge method. - arguments have been completely reworked for `create` and `modify` commands, making it possible to fine tune events. - `list` has been removed in favor of `get` which can now display several events at once rel 372

this certificates are used to enable TLS during tests. Those must be the same as in
backend_e2e (they are generated there)